Service manual

June 21,2004 2-7
NP88 FLEX DECODER
Troubleshooting
FLEX Pagers
No Power-Up
1. Ensure battery contacts are good.
2. Check Support Module pin 40 for a high to ensure the Support Module is not
resetting the £gC.
Figure 2-7. No Power-Up Troubleshooting Flowchart, FLEX Decoder
BATTERY VOLTAGE
REPLACE BATTERY
CHECK VOLTAGE AT
TSP3 = 3V
CHECK WAVEFORM AT
SUPPORT MODULE PIN 2
CHECK DECODER BOARD
ADN SOLDER JOINTS
REPLACE
SUPPORT MODULE
FAIL
FAIL
OK
OK
OK
FAIL
FAIL
FAIL
FAIL
FAIL
REPLACE OSCILLATOR
CHECK CLOCK
OSCILLATOR
OK
REPLACE DECODER
BOARD
REPLACE DECODER
BOARD
NO POWER-UP
REPLACE
FAIL
VOLTAGE AT SUPPORT
U5Pin3
≥1.30V
MODULE
REPAIR BATTERY
CONNECTIONS TO
SUPPORT MODULE PIN 49
SUPPORT CIRCUIT
SUPPORT MODULE